#include <bits/stdc++.h>
#define rep(i,n) for(int i = 0; i < (n); i++)
using namespace std;
typedef long long ll;

int main(){
    cin.tie(0);
    ios::sync_with_stdio(0);

    ll N; cin >> N;
    vector<int> C(N);
    ll s = 0;
    rep(i,N){
        cin >> C[i];
        s += C[i];
    }

    ll ans = 0;
    rep(i,N) if(C[i] * 10 <= s) ans += 1;
    cout << ans * 30 << endl;
}